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while( <> ) {
    ... # the -e snippet here
}

while( <> ) {
    ... # the part of the -e snippet before the }{ here; runs for ever
+y line in the file.
}{  # closes the while loop body and puts a bare block after it
   ... # The part of the -e snippet after the }{ goes here and is only
+ executed after the input is exhausted.
}